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Explore our core range of functional silicone oils engineered for industrial defoaming performance
Vinyl silicone oil — formally known as vinyl-terminated polydimethylsiloxane (CAS Number: 70900-21-0) — is a specialty functional silicone fluid distinguished by reactive vinyl groups (–CH=CH₂) positioned at both ends of the polysiloxane backbone. These terminal vinyl groups are not merely structural decorations; they are the chemical foundation for the material's extraordinary versatility, enabling cross-linking reactions with hydrosilane compounds and platinum catalysts to form robust, elastomeric silicone networks.
In the context of industrial defoaming, vinyl silicone oil occupies a uniquely powerful position. Its exceptionally low surface tension — typically in the range of 20–22 mN/m — allows it to spread rapidly across foam lamellae, destabilizing the thin liquid films that sustain foam bubbles. Unlike conventional hydrocarbon-based defoamers that may decompose under heat or react with aggressive chemicals, vinyl silicone oil maintains its defoaming efficacy across a broad temperature range (from –50°C to over 200°C) and resists attack by most acids, alkalis, and oxidizing agents.
Vinyl Silicone Oil (CAS: 70900-21-0) delivers ultra-low surface tension, thermal stability up to 200°C+, and chemical inertness — making it the gold standard for demanding industrial defoaming applications.
Foam formation in industrial processes is a persistent challenge driven by surface-active contaminants, mechanical agitation, dissolved gases, and process chemistry. When foam accumulates in reactors, fermenters, paper mills, wastewater treatment tanks, or coating lines, it reduces process efficiency, causes overflow losses, introduces air entrainment into products, and can even damage equipment.
Vinyl silicone oil combats foam through three synergistic mechanisms:
The vinyl end-groups further allow formulators to fine-tune the cross-link density of silicone antifoam matrices, controlling release kinetics and matching the defoaming performance profile to specific process requirements.
Why vinyl silicone oil outperforms conventional defoamers in industrial environments
Maintains defoaming performance from –50°C to over 200°C, ideal for high-temperature chemical processing, distillation, and steam-intensive operations where organic defoamers fail.
Inert to most acids, bases, oxidizers, and solvents. Vinyl silicone oil retains structural integrity in aggressive process media such as sulfuric acid baths, alkaline pulping liquors, and fermentation broths.
Surface tension of ~20–22 mN/m enables rapid spreading across foam films, delivering fast knock-down of foam at very low dosage levels (typically 10–200 ppm).
Terminal vinyl groups enable hydrosilylation cross-linking, allowing formulators to build tailored silicone antifoam matrices with controlled viscosity, particle size, and foam-suppression persistence.
Physiologically inert and compliant with major regulatory frameworks. Suitable for use in food-processing-adjacent applications and environmentally sensitive industries when properly formulated.
Available across a wide viscosity spectrum — from low-viscosity mobile fluids to high-viscosity gums — enabling precise formulation matching for specific industrial defoaming scenarios.
Silicone-based defoamers are the fastest-growing segment in the global antifoam market
The global industrial defoamer market is experiencing robust growth driven by expanding manufacturing activity in Asia-Pacific, tightening environmental regulations in wastewater treatment, and the rapid scale-up of bio-based fermentation industries. Silicone-based defoamers — with vinyl silicone oil as a key base material — command a premium share of this market due to their unmatched performance-to-dosage ratio and long service life.
Asia-Pacific, led by China, India, and Southeast Asia, accounts for the largest and fastest-growing regional demand, fueled by paper & pulp expansion, agrochemical manufacturing, and the boom in pharmaceutical API production. North America and Europe continue to be strong markets, particularly for high-purity defoamer applications in food processing, pharmaceuticals, and advanced coatings.
Vinyl silicone oil defoaming solutions across critical industrial sectors
The pulp and paper industry is one of the largest consumers of silicone defoamers globally. During chemical pulping (kraft and sulfite processes), black liquor — a highly alkaline, surfactant-rich byproduct — generates persistent foam in evaporators, digesters, and washing stages. Vinyl silicone oil-based antifoams are injected continuously into these streams, providing rapid foam knockdown at dosage rates as low as 20–50 ppm. The high alkalinity (pH 12–14) and elevated temperatures (80–130°C) of these streams make vinyl silicone oil the material of choice, as it retains defoaming efficacy where organic alternatives degrade rapidly.
Aerobic fermentation processes — used in antibiotic production, enzyme manufacturing, bioethanol, and specialty biochemical synthesis — are inherently foam-prone due to the combination of aeration, agitation, and protein-rich culture media. Foam overflow can contaminate product batches, block exhaust filters, and trigger costly process shutdowns. Vinyl silicone oil, formulated into food-grade or pharmaceutical-grade antifoam emulsions, provides effective foam control without interfering with microbial metabolism or downstream purification processes. Its chemical inertness ensures it does not inhibit enzyme activity or alter fermentation kinetics.
Municipal and industrial wastewater treatment plants face foam challenges in aeration basins, dissolved air flotation (DAF) units, anaerobic digesters, and sludge dewatering operations. Biological foam — driven by filamentous bacteria such as Microthrix parvicella and Nocardia species — is particularly problematic and resistant to mechanical foam breaking. Vinyl silicone oil antifoams, dispersed as oil-in-water emulsions, are applied to aeration basins to suppress both chemical and biological foam. Their environmental safety profile and low effective dosage make them suitable for use in sensitive receiving water environments.
High-speed jet dyeing machines, padding mangles, and finishing baths generate significant foam from surfactants, wetting agents, and dye auxiliaries. Foam in dyeing processes causes uneven dye uptake, fabric defects, and reduced machine throughput. Vinyl silicone oil-based defoamers — often formulated with emulsifiers for water dispersibility — provide fast, durable foam suppression across the full pH range of textile wet processing (pH 3–12) and at temperatures up to 140°C in pressurized jet dyeing.
In waterborne coatings and adhesive formulations, air entrainment during high-speed dispersion and application creates micro-foam and surface defects (craters, pinholes, fish-eyes) that compromise coating appearance and barrier performance. Vinyl silicone oil, incorporated at 0.1–0.5% by weight into coating formulations, acts as both a defoamer and a surface leveling agent, suppressing foam during manufacture and application while improving film smoothness and gloss.
Crude oil separation, natural gas sweetening (amine scrubbing), and refinery distillation operations all encounter foam challenges that reduce separation efficiency and can cause column flooding. Vinyl silicone oil antifoams are injected into gas sweetening contactors and crude oil separators to maintain stable operation. Their thermal stability and compatibility with hydrocarbon streams make them particularly effective in these demanding environments.
In sugar refining, edible oil processing, beverage carbonation, and dairy operations, foam control is critical for process efficiency and product quality. Food-grade silicone antifoams based on vinyl silicone oil are approved under major food safety regulations (FDA 21 CFR, EU food contact regulations) for use in specified food processing applications. They provide effective foam control in evaporators, crystallizers, and filling lines without imparting taste, odor, or toxicological risk to food products.
Where vinyl silicone oil defoaming technology is heading in the next decade
Environmental pressure is driving the development of biodegradable silicone-hybrid defoamers that combine vinyl silicone oil's performance with improved environmental profiles. Bio-based emulsifiers and carrier systems are being integrated to meet eco-label requirements in Europe and North America.
Advanced formulation science is producing nano-emulsified vinyl silicone oil antifoams with particle sizes below 200 nm, offering improved dispersion stability, lower effective dosage, and enhanced performance in high-shear process environments such as microfluidics and pharmaceutical manufacturing.
Smart manufacturing platforms are beginning to integrate real-time foam sensors with automated defoamer dosing systems. Vinyl silicone oil antifoams, with their predictable and consistent performance characteristics, are well-suited for integration into these AI-controlled process optimization loops.
Rapid industrialization in Southeast Asia, South Asia, Africa, and Latin America is creating new demand centers for high-performance defoamers. Local production capacity for silicone intermediates — including vinyl silicone oil — is expanding in China and India to serve these growing markets more efficiently.
The global boom in biologics, mRNA therapeutics, and fermentation-derived APIs is creating unprecedented demand for ultra-high-purity, regulatory-compliant silicone defoamers. Vinyl silicone oil producers are investing in GMP-grade manufacturing capabilities to serve this high-value segment.
Green hydrogen production via water electrolysis, carbon capture amine systems, and next-generation battery electrolyte processing all present new foam control challenges that vinyl silicone oil-based antifoams are uniquely positioned to address due to their electrochemical inertness and thermal stability.
Your trusted global partner for high-performance silicone chemistry
Hangzhou Bayee Chemical Co., Ltd. started chemical products exporting from 2001, manufacturers based exporter focused in chemical products covering Silicone series, Phosphorus series including Silicone Monomers, Cyclosiloxane, Silicone Oils, Agro Chemicals, Fire Retardants & Auxiliaries etc. Company has direct Import & Export right, Dangerous Cargo Permission Certificate.
Based on 20+ years exporting history and persistent improvements, we have now grown and developed into a well known & good reputation exporter with ISO 9001:2015, AAA Credit certified company, also granted by local government as Healthy Enterprise, and A level Tax Ranking.
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Based on strategic factories in Zhejiang, Jiangsu, Shandong, Anhui, Jiangxi, Hubei, Hunan, Hebei and Henan provinces etc, we export not only good quality products, competitive EXW costs, but also honesty, safety and international philosophies to customers. We work tightly with competitive production sites across whole China, who have special advantages, located in professional industrial areas, close to raw material bases, locally supplied with energy - gas or steam pipe connected with neighbour enterprises in same areas to reduce transportation costs.
Our factories have advanced ideas in technique crafts for higher yield production, unit consumption reducing from raw materials, also re-used the by-products for own downstream production for other products. By the way, we always keep close observation about raw material changing trend, react actively with factories shoulder by shoulder from organizing raw material at good times to secure more competitive production costs and share spaces with customers helping win their market shares. At the same time, we have wide connection with Chinese powerful chemical institute organizations for testing and supervising quality control in production process.
Up till now we've developed and supplied to many countries and areas all over the world, with main markets in European countries (Germany, Italy, UK, Spain, Ukraine, Russia, Poland, etc.), USA, South America, Mid East, South-east Asia, Australia, etc. Also seeking more strategic partners and customers under mutual benefits and work through the whole purchasing chain.
Full portfolio of silicone-based products for industrial defoaming and process optimization
Contact our technical team to discuss your specific foam control challenges. We provide customized vinyl silicone oil solutions, competitive pricing, and reliable global supply chain support backed by 25+ years of silicone chemistry expertise.
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